<?php

namespace App\Services;

use OSS\OssClient;
use OSS\Core\OssException;
use App\Services\CommonService;
use Input;
use Log, Exception,Image;

class UploadService
{
    //删除阿里云oss文件
    public static function deleteOssFile($object){
        $object = str_replace("https://nilife.oss-cn-beijing.aliyuncs.com/","",$object);
        try {
            $ossClient = new OssClient(config('alioss.accessKeyId'), config('alioss.accessKeySecret'), config('alioss.endpoint'));
            $ossClient->deleteObject(config('alioss.bucket'), $object);
        } catch (OssException $e) {
            Log::info($e->getMessage());
        }
    }

    public static function gmtIso8601($time) {
        $dtStr = date("c", $time);
        $pos = strpos($dtStr, '+');
        $expiration = substr($dtStr, 0, $pos);
        return $expiration . "Z";
    }

    public static function getAccessToken()
    {
        $key= config("alioss.accessKeySecret");// 请填写您的AccessKeySecret。
        $dir = "";// 用户上传文件时指定的前缀。
        $callback_param = array('callbackUrl'=>config("alioss.callbackUrl"), 
                     'callbackBody'=>'filename=${object}&size=${size}&mimeType=${mimeType}&height=${imageInfo.height}&width=${imageInfo.width}', 
                     'callbackBodyType'=>"application/x-www-form-urlencoded");
        $callback_string = json_encode($callback_param);

        $base64_callback_body = base64_encode($callback_string);
        $now = time();
        $expire = 300;  //设置该policy超时时间是10s. 即这个policy过了这个有效时间，将不能访问。
        $end = $now + $expire;
        $expiration = self::gmtIso8601($end);


        //最大文件大小.用户可以自己设置
        $condition = array(0=>'content-length-range', 1=>0, 2=>1048576000);
        $conditions[] = $condition; 

        // 表示用户上传的数据，必须是以$dir开始，不然上传会失败，这一步不是必须项，只是为了安全起见，防止用户通过policy上传到别人的目录。
        $start = array(0=>'starts-with', 1=>'$key', 2=>$dir);
        $conditions[] = $start; 


        $arr = array('expiration'=>$expiration,'conditions'=>$conditions);
        $policy = json_encode($arr);
        $base64_policy = base64_encode($policy);
        $string_to_sign = $base64_policy;
        $signature = base64_encode(hash_hmac('sha1', $string_to_sign, $key, true));

        $response = array();
        $response['accessid'] = config("alioss.accessKeyId");
        $response['host'] = config("alioss.url");
        $response['policy'] = $base64_policy;
        $response['signature'] = $signature;
        $response['expire'] = $end;
        $response['callback'] = $base64_callback_body;
        $response['dir'] = $dir;  // 这个参数是设置用户上传文件时指定的前缀。
        return json_encode($response);
    }
}
